Gas filter bag structure



1970 A. R. GETZIN EIAL I 3,541,7 7

GAS FILTER BAG STRUCTURE Y Filed April 21, 1969 INVENTOR ,4//0/1 Qfiezfg/n flaw'a 5. 50/7 y v ATTORNEY United States Patent 3,541,767 GASFILTER BAG STRUCTURE Allan R. Getzin and David E. Bonn, Louisville, Ky.,

assignors to American Air Filter Company, Inc., Louisville, Ky., acorporation of Delaware Filed Apr. 21, 1969, Ser. No. 817,831 Int. Cl.B0111 46/02 US. Cl. 55-378 4 Claims ABSTRACT OF THE DISCLOSUREBACKGROUND OF THE INVENTION The present invention relates to an improvedfilter apparatus for gas separation, and more particularly, to animproved support structure for holding the mouth portions of filter bagsin side-by-side relation.

A number of filter bag arrangements are known in the art of gasfiltration wherein the mouth portions of the bags are retained in aflow-through border frame. These past arrangements have includedcomplex, time-consuming and expensive structures to fasten the mouthportions to the support frame and have required considerable effort inassembly and maintenance, further requiring various sealant materialsalong a multitude of places to avoid possible leak passages between theframe and the mouth portions of the bags.

SUMMARY OF THE INVENTION The present invention, recognizing that pastsupport arrangements have presented problems in construction, mounting,sealing, wear, clamping and leakage, as well as problems in assembly andremoval, provides a filter bag support structure arrangement which isstraightforward and economical in construction and maintenance, allowingquick installation and removal with a minimum of leakage and a maximumof access for installation, repair and removal. In addition, the presentinvention provides an arrangement which permits accurate relativealignment of the several filter bags in a support structure and avoidingthe application of expensive sealant materials along the edges of thebags.

Various other features of the present invention will become obvious toone skilled in the art upon reading the disclosure set forth herein.

More particularly, the present invention provides an improved filter bagstructure comprising: at least two open-mouth filter bags, each having aflow-through rigid mouth-shaping member disposed in the open-mouthportion of the bag;-and a flow-through peripheral border frame means ofchannel-shaped cross section to receive opposed ends of each of themouth-shaping members and the mouth portions associated therewith tosupport the filter bags, the border frame means being sized relative thebreadth of the mouth-shaping members so that the mouth-shaping membersare held in fast, side-by-side relation to firmly grasp the mouthportions of the filter bags therebetween.

It is to be understood that various changes can be made in thearrangement, form, and construction of the apparatus disclosed hereinwithout departing from the scope or spirit of the present invention.

3,541,767. Patented Nov. 24, 1970 Referring to the drawing whichdiscloses one advantageous embodiment of the present invention andseveral modifications thereto:

FIG. 1 is a plan view of an improved filter bag structure of the presentinvention;

FIG. 2 is a side view of the filter bag structure of FIG. 1;

FIG. 3 is a cross-sectional view of the border frame only taken in aplane through line 3-3 of FIG. 1;

FIG. 4 is an enlarged side view of one advantageous embodiment of amouth-shaping member for one of the filter bags;

FIG. 5 is a plan view of the mouth-shaping member of FIG. 4;

FIG. 6 is an enlarged side View of the mouth-shaping member of FIG. 5disclosing details of the mouth-shaping member in its relationship withan immediately adjacent mouth-shaping member;

FIG] is an enlarged side view silimar to FIG. 6, disclosing a modifiedmouth-shaping member arrangement; and

FIG. 8 is an enlarged side view similar to FIGS. 6 and 7 disclosingstill another modified mouth-shaping arrangement.

Referring to the drawings, the novel filter structure is disclosed asincluding a flow-through peripheral border frame 2 which can be ofrectangular configuration and which, as can be seen in FIG. 3 of thedrawing, is of U- or channel-shaped cross section. Advantageously, frame2 can be made from any one of a number of suitably rigid materials suchas a light gauge aluminum. At least one side of frame 2, as designatedby reference numeral 4, can be moved aside during bag assemblyoperations to provide an over-all frame of U-shaped configuration forinsertion of opposed ends of filter bags 5 in opposed channels of frame2 so that the bags are in side-by-side relation, all in a mannerdescribed hereinafter. Referring to FIGS. 2 and 4 to 6 of the drawings,each of filter bags 5 can be provided with a rigid mouth-shaping member6 which can be made of a suitably rigid material such as aluminum.Mouth-shaping member 6 can be sized so that it can be readily disposedin an open-mouth portion of a filter bag 5 in snug relationshiptherewith. Once a mouthshaping member is properly disposed in a filterbag, 0pposed ends of the mouth of the bag can then be inserted inopposed U-shaped channels of opposed sides of border frame 2, the side 4of frame 2 being set aside to permit insertion of the bag mouths. Thus,the bags can be supported in side-by-side relation in border framemember 2. In this connection, it is to be noted that border frame member2 is so sized relative the breadth of mouthshaping members 6 that themouth-shaping members are held in fast side-by-side relation when side 4is replaced so as to firmly grip the mouth portions of filter bags 5therebetween. It is to be understood that filter bags 5 can be made fromany one of a number of suitable filter media such as a random lay fiberglass material with a selected amount of organic binder. It further isto be understood that other types of filter media can be utilized, andthat the filter media need not be shaped in the manner disclosed, butcan assume any one of several shapes well known in the art.

As can be seen in FIGS. 2 and 4 to 6 of the drawing, each ofmouth-shaping members 6 comprises a pair of spaced parallel side bars 7connected together by sets of spaced transverse cross bars 8. It is tobe noted that side bars 7 of each mouth-shaping member 6 is ofcorresponding V-shaped cross section with the legs of the V of both sidebar cross sections extending in a similar direction whereby adjacentside bars 7 of adjacent mouthshaping members 6 nestingly grip the mouthportions of filter bags 5 therebetween when they are inserted in borderframe member 2, attention being directed particularly to FIG. 6 of thedrawing. As also will be noted in FIG. 6 of the drawing, each of thepairs of spaced parallel side bars 7 has one correspondingly positionedbar of the pair provided with a longitudinally extending hooked orrightangle edge member 9 which extends therefrom in hooked overlaprelation with the top edge of the other bar of the pair of bars 7 of animmediately adjacent mouth-shaping member 6 to grip the adjacentmouth-shaping members in fast relation and to cover the top portions ofthe mouth of the filter bag 5 nesting therebetween. As can be seen inFIG. 8, in another embodiment of the invention, the hook-shaped membercan be omitted if so desired.

Referring to FIG. 7. of the drawings, mouth-shaping members 11 aredisclosed comprised of spaced parallel cylindrical side rods 12connected together by sets of spaced transverse cross bars 13 in amanner similarly described for the embodiment of FIG. 5. Eachmouthshaping member 11 of FIG. 7 has a single side rod 12 on one sideand a pair of selectively spaced parallel rods 12 on the other sidewhereby the single rod of one side of a mouth-shaping member 11 nestswith a pair of selectively spaced parallel rods of an adjacent side ofan adjacent mouth-shaping member to grip the mouth portions of thefilter bags therebetween.

In the arrangements abovedescribed, it can readily be seen that it onlyis necessary to quickly insert a rigid mouth-shaping member in a filterbag and slip the opposed ends of the mouth-shaping members and thesurrounding mouth portions of the filter bag in the opposed channelsections of opposite sides of a border frame 2. Once the selected numberof filter bags 5 are placed in side-by-side relation in frame 2, theopen-ended side 4 of frame member 2 can be closed to hold the filter bagmouth portions in fast relationship. Thus, the over-all filter bagstructure can be assembled in a quick and efficient manner with aminimum of steps, with a minimum of materials, and without edge sealantmaterials.

The invention claimed is:

1. An improved filter bag structure comprising: at

least two open-mouthed filter bags, each having a fiowthrough rigidmouth-shaping member disposed in the open mouth portion of said bag; anda flow-through peripheral border frame means of channel-shaped crosssection to receive opposed ends of each said mouthshaping members andthe mouth portions associated therewith to support said filter bags,said border frame means being so sized relative the breadth of saidmouthshaping members that said mouth-shaping members are held in fastside-by-side relation to firmly grip the mouth portions of said filterbags therebetween, said mouth-shaping members each comprising a pair ofspaced parallel side bars connected together by sets of spacedtransverse, cross bars, said side bars having a corresponding V-shapedcross section with the legs of the V of both side bar cross sectionsextending in a similar direction whereby adjacent side bars of adjacentmouth-shaping members nestingly grip the mouth portions of said filterbags therebetween. i

2. The apparatus of claim 1 each of said pair of spaced parallel sidebars of each mouth-shaping member having one correspondingly positionedbar thereof with a longitudinally extending hooked top edge memberextending therefrom in hooked overlap relation with the top edge of theother bar of an immediately adjacent mouth-shaping member to hold saidadjacent mouth-shaping memher in fast relation and to cover the topportions of said filter bags nesting therebetween. 3. The apparatus ofclaim 1, said border frame means and said mouth-shaping members being ofrectangular configuration with one side of said border frame beingremovable to permit insertion of said filter bag mouth portions withtheir rectangular mouth-shaping members disposed therein.

4. An improved filter bag structure comprising: at least twoopen-mouthed filter bags each having a flowthrough rigid mouth-shapingmember disposed in the open mouth portion of said bag; and aflow-through peripheral border frame means of channel-shaped crosssection to receive opposed ends of each of said mouthshaping members andthe mouth portions associated therewith to support said filter bags,said border frame means being so sized relative the breadth of saidmouth shaping members that said month-shaping members are held in fastside-by-side relation to firmly grip the mouth portions of said filterbags therebetween, said mouth shaping members each comprising spacedparallel cylindrical side rods connected together by sets of spacedtransverse cross bars, said mouth-shaping members each having a singleside rod on one side and a pair of spaced parallel rods on the otherside whereby the single rod of one mouth-shaping member nests with saidpair of parallel rods of an adjacent mouth-shaping member to grip themouth portions of said filter bags therebetween.

References Cited UNITED STATES PATENTS 3,190,059 61/1965 Bauder et al.-499 X 3,289,394 12/1966 Young 55341 TIM R. MILES, Primary Examiner V.GIFFORD, Assistant Examiner US. Cl. X.R.

